O’SHEA, CRYAN & BOGAN: UNITED STATES BAT SPECIES OF CONCERN 
105 
1981). Captures of night-roosting bats at five bridges in western hemlock forest in the Willamette 
National Forest of Oregon included eight species and 412 individuals, but no western small-foot¬ 
ed myotis (Perimeter, 1996). This species ranked seventh in relative abundance (40 captures of 
1,057 individuals of 11 species) of bats captured over water in the predominantly ponderosa pine 
forests of the eastern Cascade Mountains of south-central Washington (Baker and Lacki, 2004). 
This species ranked third in relative abundance (80 individuals) among 12 species and 958 bats 
captured over water in the semi-arid Okanagan Valley of southern British Columbia (Woodsworth, 
1981). They ranked fifth in relative abundance (23 captures) in the same region during an earlier 
study where 351 bats of nine species were taken in nets or traps over or near water (Fenton et al., 
1980). 
Montana'. Western small-footed myotis were the most abundant of nine species (74 of 231 
individuals) of bats captured over water in the Pryor Mountains of south-central Montana (Wor¬ 
thington, 1991). 
California and Nevada: The first records of western small-footed myotis in California were 
at elevations from 1,340 to 1,830 meters in upper Sonoran to Transition zones (Grinnell and 
Swarth, 1913). They ranked seventh of 17 species (16 individuals among 390 bats) captured in mist 
nets at 19 sites in the Sierra Nevada mountain range of California during 1993-1999 (Pierson et 
al., 2001) but were not reported in a mist-net survey both over water and within forests (concen¬ 
trating on groves of giant sequoia trees, Sequoiadendron giganteum ) that recorded ten species and 
284 individuals in Yosemite National Park (Pierson et al., 2006). Along montane areas around the 
upper Sacramento River in northern California, they were infrequently captured in mist nets set 
over water, numbering five bats among 1,398 captures of 15 species during four summers, ranking 
fifth least abundant (Pierson et al., 1996b). They were not observed using bridges as night roosts 
along the upper Sacramento River in montane hardwood and conifer habitats (elevations 320-730 
meters), although 2,132 individuals of nine species of bats were documented using these structures 
at night (Pierson et al., 1996b). These bats also were not documented in mist-netting surveys in 
Whiskeytown National Recreation Area in Shasta County, California, where 47 sites between 256 
and 1,899 meters elevation were sampled in a variety of habitats, ranging from chaparral to Dou¬ 
glas fir forests, and 403 bats of 10 other species were captured (Duff and Morrell, 2007). 
Western small-footed myotis were intermediate in abundance (33 captures), ranking sixth 
among about 2,000 bats of 13 species netted over water in the White and Inyo Mountain ranges of 
Nevada and California, where they were taken in upper Mojave and Great Basin desert scrub 
through pinon-juniper woodland habitats (Szewczak et al., 1998). In contrast, this was the most 
abundant species taken (80 individuals among 299 bats of 10 species) in mist nets over water across 
a variety of habitats ranging from 1,200 to over 2,800 meters in west-central Nevada (Kuenzi et al., 
1999). They were the third most abundant bat found using a variety of mist-netting techniques and 
utilized all of six habitat categories in northeastern Nevada, ranging in elevation from 1,400 to 
2,620 m (Ports and Bradley, 1996). 
Southwestern U.S.: Arizona: Western small-footed myotis were relatively uncommon in cap¬ 
ture records that were predominantly in desert habitats of western Arizona, where 66 individuals 
were taken among 3,458 bats netted over water (ranking tenth in relative abundance out of 17 
species), with most appearing to have been taken in woodlands or forested habitats in mountains 
rather than in the more lowland desert; it was noted that these bats were not very susceptible to cap¬ 
tures in mist nets (Cockrum et al., 1996). They ranked eighth in abundance among 17 species of 
bats (32 captured of 1,171 total bats netted) taken over water mostly in ponderosa pine and pinon- 
juniper habitats of the Arizona Strip in northwestern Arizona (Herder, 1998). Western small-foot¬ 
ed myotis ranked ninth in relative abundance (22 taken among 1,441 individuals) of 14 species cap- 
